body { font-family: 'Segoe UI', system-ui, sans-serif; line-height: 1.6; color: var(--dark); background: #f5f7fa; padding: 0; }

    /* === 文章容器 === */
    .blog-container {
        max-width: 900px;
        margin: 40px auto;
        padding: 0 20px;